diff --git a/CMakeLists.txt b/CMakeLists.txt
index 79504346..42c140e9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -31,7 +31,7 @@ set(COMPILE_ERPC_LIB ON)
 # Options exposed to the user
 set(TRANSPORT "dpdk" CACHE STRING "Datapath transport (infiniband/raw/dpdk)")
 option(ROCE "Use RoCE if TRANSPORT is infiniband" OFF)
-option(PERF "Compile for performance" OFF)
+option(PERF "Compile for performance" ON)
 set(PGO "none" CACHE STRING "Profile-guided optimization (generate/use/none)")
 set(LOG_LEVEL "warn" CACHE STRING "Logging level (none/error/warn/info/reorder/trace/cc)") 
 cmake_dependent_option(LTO "Use link time optimization" ON "PERF" OFF)
diff --git a/README.md b/README.md
index 18636d8a..7bec9aaa 100644
--- a/README.md
+++ b/README.md
@@ -36,6 +36,8 @@ Some highlights:
 ## eRPC quickstart
  * Build and run the test suite:
    `cmake . -DPERF=OFF -DTRANSPORT=infiniband; make -j; sudo ctest`.
+   * `DPERF=OFF` enables debugging, which greatly reduces performance. Set
+     `DPERF=ON` for performance measurements.
    * Here, `infiniband` should be replaced with `raw` for Mellanox Ethernet
      NICs, or `dpdk` for Intel Ethernet NICs.
    * A machine with two ports is needed to run the unit tests if DPDK is chosen.
@@ -76,7 +78,7 @@ Some highlights:
  * To build an application, create `scripts/autorun_app_file` and change its
    contents to one of the available directory names in `apps/`. See
    `scripts/example_autorun_app_file` for an example. Then generate a
-   Makefile using `cmake . -DPERF=ON/OFF -DTRANSPORT=raw/infiniband/dpdk`. 
+   Makefile using `cmake . -DPERF=ON -DTRANSPORT=raw/infiniband/dpdk`. 
  * Each application directory in `apps/` contains a config file
    that must specify all flags defined in `apps/apps_common.h`. For example,
    `num_processes` specifies the total number of eRPC processes in the cluster.
diff --git a/scripts/topo/xl170-topo.sh b/scripts/topo/xl170-topo.sh
index 1824016c..3f3d9fde 100755
--- a/scripts/topo/xl170-topo.sh
+++ b/scripts/topo/xl170-topo.sh
@@ -1,13 +1,24 @@
 #!/usr/bin/env bash
-# Prints the nodes under each switch in CloudLab's xl170 cluster
-source $(dirname $0)/utils.sh
+#
+# * Prints the nodes under each switch in CloudLab's xl170 cluster
+#
+# * This script assumes that node n is named
+#   akalianode-n.RDMA.ron-PG0.utah.cloudlab.us
+#
+# * Usage: In a cluster with N experiment nodes, run ./xl170-topo.sh N
+#
+
 if [ "$#" -ne 1 ]; then
   echo "Illegal number of parameters"
 	echo "Usage: ./xl170-topo.sh <number of nodes to look up>"
 	exit
 fi
 
-bad_nodes="hp097"
+# Fill this up with nodes that you don't want. Example:
+# bad_nodes = "hp097"
+bad_nodes=""
+
+# We'll place the nodes under switch n in topodir/switch_n
 topodir="/tmp/xl170_topo"
 rm -rf $topodir
 mkdir $topodir
@@ -18,12 +29,12 @@ for ((i = 1; i <= $1; i++)); do
   hostname="akalianode-$i.RDMA.ron-PG0.utah.cloudlab.us"
 
   # Get the HP node ID (e.g., hp012 from hp012.utah.cloudlab.us)
-	hpnode_id=`ssh -oStrictHostKeyChecking=no $hostname \
+  hpnode_id=`ssh -oStrictHostKeyChecking=no $hostname \
     "hostname -A | cut -d '.' -f 1"`
 
   # Ignore if node is bad
   if [[ $bad_nodes == *"$hpnode_id"*  ]]; then
-    blue "Ignoring bad node $hpnode_id ($hostname)"
+    echo "Ignoring bad node $hpnode_id ($hostname)"
   else
     hpnode_id=`echo $hpnode_id | sed 's/hp0*//g'` # Trim leading hp and zeros
     switch_id=$(( ($hpnode_id - 1) / 40 ))
@@ -34,13 +45,13 @@ for ((i = 1; i <= $1; i++)); do
 done
 wait
 
-# Here, temp contains <hostname> <switch_id>
+# Here, file temp contains <hostname> <switch_id>
 # Print out the nodes under each switch
 echo ""
 for ((switch_i = 0; switch_i < 5; switch_i++)); do
   nodes_file=$topodir/switch_$switch_i
   count=`cat temp | grep " $switch_i" | wc -l`
-  blue "Under switch $switch_i ($count nodes):"
+  echo "Under switch $switch_i ($count nodes):"
   cat temp | grep " $switch_i" | cut -d' ' -f 1 | sort -n > $nodes_file
   sed -e 's/$/ 31850 0/' -i $nodes_file  # Append UDP port and NUMA node
   cat $nodes_file
diff --git a/src/rpc.h b/src/rpc.h
index ec69d993..cb41e118 100644
--- a/src/rpc.h
+++ b/src/rpc.h
@@ -95,8 +95,11 @@ class Rpc {
    * \param sm_handler The session management callback that is invoked when
    * sessions are successfully created or destroyed.
    *
-   * @param phy_port An Rpc object uses one physical port. This is the
-   * zero-based index of that port among active ports.
+   * @param phy_port An Rpc object uses one physical port on the NIC. phy_port
+   * is the zero-based index of that port among active ports, as listed by
+   * `ibv_devinfo` for Raw, InfiniBand, and RoCE transports; or by
+   * `dpdk-devbind` for DPDK transport.
+   * 
    * @throw runtime_error if construction fails
    */
   Rpc(Nexus *nexus, void *context, uint8_t rpc_id, sm_handler_t sm_handler,
diff --git a/src/transport_impl/verbs_common.h b/src/transport_impl/verbs_common.h
index 8eeacfe5..4fa5d565 100644
--- a/src/transport_impl/verbs_common.h
+++ b/src/transport_impl/verbs_common.h
@@ -228,7 +228,7 @@ static void common_resolve_phy_port(uint8_t phy_port, size_t mtu,
 
   // If we are here, port resolution has failed
   assert(resolve.ib_ctx == nullptr);
-  xmsg << "Failed to resolve RoCE port index " << std::to_string(phy_port);
+  xmsg << "Failed to resolve verbs port index " << std::to_string(phy_port);
   throw std::runtime_error(xmsg.str());
 }
 }  // namespace erpc